Of course it is okay, you are definitely getting a Christmas card! :)

I sort of doubt my brother read his school related books, he just barely graduated from upper secondary school. I approve of you trying to brainwash your brother to read, you are obviously a good sister for doing that. :D It somehow seems that boys in general like to read less. I know my mum has read to me and brother when we were kids but only I ended up spending hours and hours with books.